Comparative Evaluation of Physical and Mechanical Properties of Different Brands of Primary Molar Stainless-Steel Crowns: An In Vitro Study

Zhaleh  Bamdadian; Nilgoon Pasdar; Abdolhamid  Alhavaz; Shahram  Ghasemi; Ali  Bijani

doi:10.3889/oamjms.2019.861

Authors

Zhaleh Bamdadian Department of Pediatric Dentistry, Faculty of Dentistry, Mazandaran University of Medical Sciences, Sari, Iran
Nilgoon Pasdar Health Research Institute, Dental Material Research Center, Department of Pediatric Dentistry, Faculty of Dentistry, Babol University of Medical Sciences, Babol, Iran
Abdolhamid Alhavaz Dental Material Research Center, Health Research Institute, Department of Prosthodontics, Babol University of Medical Sciences, Babol, Iran
Shahram Ghasemi Faculty of Chemistry, University of Mazandaran, Babolsar, Iran
Ali Bijani Social Determinant of Health Research Center, Health Research Institute, Babol University of Medical Sciences, Babol, Iran

DOI:

https://doi.org/10.3889/oamjms.2019.861

Keywords:

Stainless steel, Crown, Hardness, Wear, Corrosion

Abstract

BACKGROUND: There is some cases of perforation and undesirable properties of some primary molars stainless steel crowns.

AIM: The aim of this study was to compare the physical and mechanical properties of different commercial brands of these crowns.

METHODS: In an in vitro study, a total of 10 stainless steel tooth crowns of the second primary mandibular molars size 6 of 4 different commercial brands (a total of 280 crowns) were evaluated. These crowns were included KTR Pre-trimmed and Crimped Nichro Stainless Steel Primary Molar Crowns (KTR, China); 3M Stainless Steel Primary Molar Crowns (ESPE, St paulÍ¾ USA); NuSmile SSC Pre-contoured (Inc, Houstone, TXÍ¾ USA) and Kids crown (Shinghung, SeoulÍ¾ Korea). Corrosion and galvanic corrosion, wear, microhardness, compressive strength, fatigue strength of crowns and weight percent of elements were investigated.

RESULTS: The highest rate of microhardness, compressive and Fatigue strength of the crowns were made by Nu Smile > 3M > Kids Crown > KTR respectively. The highest rate of corrosion potential in corrosion and Galvanic corrosion tests was in KTR > Kids crowns > 3M > Nu smile respectively. The order of crown wear was KTR > Kids Crown > 3M > Nu Smile respectively. The highest amount of nickel element was found in the Nu Smile crown and the highest amount of chrome in the 3M crown with a significant difference with others (p < 0.001). The KTR and Kids crowns lacked molybdenum.

CONCLUSION: The results showed that Nu Smile crown has better physical and mechanical properties than other evaluated crowns in this study.